各位兄台，结帖。。。。。。

俺在 好友的档里有一列名是 friend，用于记录互加好友与分组。在关联表时，因为对同一表要关联两次，所以就在 User 的表里加了两行

has_many :master, :class_name => "Circle", :foriegn_key => "user_id" has_many :friend, :class_name => "Circle", :foriegn_key => "friend"

所以造成 Circle.friend 无法赋值。

原以为自己发明了新东西，谁知—— SB 总是一次又一次滴证明自己是一个 SB。

I am sorry. It because in User with has_many :friend, :class_name => "Circle", :foriegn_key => "friend"

@lgn21st , Look

1.9.3-p286 :002 > c = Circle.new => # 1.9.3-p286 :003 > c.friend = "1" ActiveRecord::AssociationTypeMismatch: User(#89151910) expected, got String(#78194320) from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/association.rb:204:in raise_on_type_mismatch' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/belongs_to_association.rb:6:inreplace' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/singular_association.rb:17:in writer' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/builder/association.rb:51:inblock in define_writers' from (irb):3 from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:47:in start' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:8:instart' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands.rb:41:in <top (required)>' from script/rails:6:inrequire' from script/rails:6:in <main>' 1.9.3-p286 :004 > c.friend = "1".to_i ActiveRecord::AssociationTypeMismatch: User(#89151910) expected, got Fixnum(#78191590) from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/association.rb:204:inraise_on_type_mismatch' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/belongs_to_association.rb:6:in replace' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/singular_association.rb:17:inwriter' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/builder/association.rb:51:in block in define_writers' from (irb):4 from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:47:instart' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:8:in start' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands.rb:41:in' from script/rails:6:in require' from script/rails:6:in

' 1.9.3-p286 :005 > c.friend = 1 ActiveRecord::AssociationTypeMismatch: User(#89151910) expected, got Fixnum(#78191590) from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/association.rb:204:in raise_on_type_mismatch' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/belongs_to_association.rb:6:inreplace' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/singular_association.rb:17:in writer' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/builder/association.rb:51:inblock in define_writers' from (irb):5 from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:47:in start' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:8:instart' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands.rb:41:in <top (required)>' from script/rails:6:inrequire' from script/rails:6:in <main>' 1.9.3-p286 :006 > c.friend = 1111 ActiveRecord::AssociationTypeMismatch: User(#89151910) expected, got Fixnum(#78191590) from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/association.rb:204:inraise_on_type_mismatch' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/belongs_to_association.rb:6:in replace' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/singular_association.rb:17:inwriter' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/builder/association.rb:51:in block in define_writers' from (irb):6 from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:47:instart' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:8:in start' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands.rb:41:in' from script/rails:6:in require' from script/rails:6:in' 1.9.3-p286 :007 > c => # 1.9.3-p286 :008 > c.frind = a NameError: undefined local variable or method a' for main:Object from (irb):8 from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:47:instart' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:8:in start' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands.rb:41:in' from script/rails:6:in require' from script/rails:6:in' 1.9.3-p286 :009 > c.frind = "a" NoMethodError: undefined method frind=' for #<Circle:0xa890030> from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activemodel-3.2.9/lib/active_model/attribute_methods.rb:407:inmethod_missing' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/attribute_methods.rb:149:in method_missing' from (irb):9 from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:47:instart' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:8:in start' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands.rb:41:in' from script/rails:6:in require' from script/rails:6:in' 1.9.3-p286 :010 > c.friend = "a" ActiveRecord::AssociationTypeMismatch: User(#89151910) expected, got String(#78194320) from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/association.rb:204:in raise_on_type_mismatch' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/belongs_to_association.rb:6:inreplace' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/singular_association.rb:17:in writer' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/builder/association.rb:51:inblock in define_writers' from (irb):10 from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:47:in start' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:8:instart' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands.rb:41:in <top (required)>' from script/rails:6:inrequire' from script/rails:6:in <main>' 1.9.3-p286 :011 > c.friend = 1 ActiveRecord::AssociationTypeMismatch: User(#89151910) expected, got Fixnum(#78191590) from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/association.rb:204:inraise_on_type_mismatch' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/belongs_to_association.rb:6:in replace' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/singular_association.rb:17:inwriter' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.9/lib/active_record/associations/builder/association.rb:51:in block in define_writers' from (irb):11 from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:47:instart' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands/console.rb:8:in start' from /home/syutran/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.9/lib/rails/commands.rb:41:in' from script/rails:6:in require' from script/rails:6:in'

冤枉啊，＠吕胖子，在下说的句句实言，还望大人明察。 你给它武值，它就报： ActiveRecord::AssociationTypeMismatch: expected, got Fixnum 俺就在武值时加上 to_s，它就 ActiveRecord::AssociationTypeMismatch: expected, got String 改为 friend_id 就安静了。

web 敏捷之道，照着实例做一遍，差不多就算入门了。

web 敏捷之道，照着实例做一遍，差不多就算入门了。

多谢 @chucai 兄指点，高人啊！！

多谢@winnie 兄，我现在所用的可能就是这一款。应该是 twitter 的，而不是 google 的，或着是独立第三方的。

估计在性能和安全方面使很多人怀疑吧？ 不是说 twitter 就是 ROR 么？只是听说，twitter 的墙太厚，俺没用过，只是听说而已，不足信。

@ichord 兄台，我说的是 datetimepicker，不是 datepicker。我觉得 twitter 的 datetimepicker 就做的不错，选择日期后继续选择时间。虽然这种控件不多用，一旦用到，还是很纠结的。

可惜没找到 datetimepicker 如果有，我会考虑使用它。

山东联通，github 全部被墙，R 就一个字

Markdown 的标题应该是两个＝＝吧 =标题 ==标题 ===标题 ====标题 =====标题 ======标题 (1..99999999999999999999999999999999999999999999999999).each do

不好意思，这个提交回复的按钮点了好多次都没有动弹，想刷新再次提交，谁知就变这样了。八格

被墙是啥麻意思？哦不懂，好高深。 是不是被抢的谐音？网站可以抢吗？今天是你的，明天就可能是他的？ 大家不要怕，来个《欧洲野餐计划》，有木有？

大漠沙如雪，支持！

陈经理，俺的手机上没有 O 键，电话没法打，俺就在这留言吧！

四年 ROR 经验与一年 ROR 经验咋分呢？ruby-china 的注册日期？

controllers def new @category = current_user.categories.new @categories = current_user.categories.all

respond_to do |format| format.html # new.html.erb format.json { render json: @category } end

new.html.erb

<%= f.collection_select :parent_id, @categories, :id, :title,:include_blank => true %>

报错： NoMethodError in Categories#create

undefined method `map' for nil:NilClass

估计是 @categories 不合 collection_select 的要求，大伙给的例子多是 Category.all，那是所有的类，俺想要某个人单独的类。

搞了一下午，天还没有亮。

@doitian 老弟，虽然我搞了个九级英语的证书，但您这个 github 还是让我头肿。Thank you ...

if you not in [富二代] do 辛苦

＠李滑溜，今天的彩票就不要买了吧

我的那帖：印式英语的帖子好像没了，那个伙计的学英语的热帖也没了。 crontab 30 3 * * * mysqldump -uroot -ppassword "一群傻逼" >/usr/local/的梦话{#date}.sql.bak 可以有

自从俺在生产机的根目录里 chmod 777 -R 以后，俺再也没用 root 登录过生产机。

每次活动都想参加，可惜不在任何地方。

虽然俺只搞到半瓶子 ROR，您这个 offer 很诱人

syutran#gmail.com

找到了，呵呵。 就是把 vendor/plugins 下的目录加到 Gemfile 里去，然后把这个 plugins 里的东西清空。 另外，3.2.9 好像不再支持 rhtml 了，要改为 html.erb

多谢三位兄弟。